MATERIAL 物质, [C] a particular type of solid, liquid, or gas

物质:

The leaves were covered with a strange sticky substance.

树叶上覆着一层奇怪的黏乎乎乎乎的东西。

harmful substances in the atmosphere

大气中的有害物质

Plutonium 238 is one of the most toxic substances known to man.

钚238 是人类已知的毒性最强的物质之一。

Police found an illegal substance in his car.

警察在他的车里发现了违禁品。

TRUTH 事实, [U usually in questions and negatives] [formal] if something has substance, it is true

事实:

There is no substance to the rumours (=they are untrue) .

这些传说毫无根据。

O'Connell's remarks are completely without substance.

奥康奈尔说的话完全站不住脚。

IDEAS 思想, [sing., U] the most important ideas contained in an argument or piece of writing

〔论点、文章的〕主旨，主要内容; 真谛;

The substance of his argument was that people on welfare should work.

他论点的主旨是享受社会福利的人应该去工作。

What she said, in substance, was that the mayor should resign.

她所说的中心意思是市长应该辞职。

IMPORTANCE 重要性, [U] [formal] importance

重要性;

It was an entertaining speech, but it lacked substance (=there was no important information in it) .

那是一篇很有趣味的演讲，但是没有多少实质内容。

We should be discussing matters of substance.

我们应该讨论重大问题。

man / woman of substance, [BrE literary] a rich man or woman

富人，有财产的人